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In this paper, the authors have designed robust spectrum leasing solutions among N secondary users with a constraint on the total interference at a particular primary receiver (where robustness is with respect to the selfish behavior of the secondary users). They have used a secondary network power control game to model the secondary behavior. They have introduced a back-off mechanism at the primary system in order to enforce a given power allocation on the secondary users that guarantees that the primary link target quality of service is not affected. Then, with the random back-off mechanism in place, they have identified some special power allocations that are Nash Equilibrium (NE).
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